UTILIZING A NEW, PATENT PENDING HYDRONIC OUTDOOR WOOD BOILER, HEISS HEATER IS MADE FROM A REVOLUTIONARY MASONRY MATERIAL AND IS UNAFFECTED BY EXTREME TEMPERATURES OR CORROSION. ABLE TO REACH AND WITHSTAND INTERNAL TEMPERATURES OF 2100 DEGREES FAHRENHEIT, OUR HEATERS BURN CLEANER AND HOTTER AS A RESULT OF THEIR "CERAMIC EFFECT", RESULTING IN A MORE EFFICIENT BURN WITH LESS SMOKE AND ONLY MINIMAL CREOSOTE. HEISS HEATERS ARE BUILT TO LAST AND PROVIDE, CLEAN, GREEN HEAT. EASY TO INSTALL, MORE EFFICIENT HEATING, LESS CLEANING, NO POTENTIAL WELDS THAT MAY BREAK, IT'S APPARENT, HEISS MEANS HOT!